Infrared microreflectance study of the pressure effect on the structural properties of magnetically aligned single-wall carbon nanotubes

Kuntscher, C. A. and Thirunavukkuarasu, K. and Kamarás, Katalin and Simon, F. and Walters, D. A. (2008) Infrared microreflectance study of the pressure effect on the structural properties of magnetically aligned single-wall carbon nanotubes. PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 245. pp. 2288-2291. ISSN 0370-1972

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Abstract

The optical response of magnetically aligned single-wall carbon nanotube films was studied by polarization-dependent reflectance measurements in the infrared and visible frequency range as a function of external pressure. At ambient pressure the optical properties are anisotropic and show the characteristic excitations (broad infrared peak and optical transitions). The pressure-induced shift of the optical transitions reveals an anomaly at a critical pressure P-c approximate to 2.7 GPa. This anomaly can be attributed to the circular-to-oval structural phase transition in the nanotubes.

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